20401442155 has 4 divisors (see below), whose sum is σ = 24481730592. Its totient is φ = 16321153720.

The previous prime is 20401442077. The next prime is 20401442183. The reversal of 20401442155 is 55124410402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20401442155 - 2¹⁵ = 20401409387 is a prime.

It is a super-2 number, since 2×20401442155² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040144211 + ... + 2040144220.

It is an arithmetic number, because the mean of its divisors is an integer number (6120432648).

Almost surely, 2^20401442155 is an apocalyptic number.

20401442155 is a deficient number, since it is larger than the sum of its proper divisors (4080288437).

20401442155 is an equidigital number, since it uses as much as digits as its factorization.

20401442155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080288436.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 20401442155 its reverse (55124410402), we get a palindrome (75525852557).

The spelling of 20401442155 in words is "twenty billion, four hundred one million, four hundred forty-two thousand, one hundred fifty-five".